Valveless lubricating-pump.



O. HAJEK.

VALVELESS LUBRIGATING PUMP. APPLICATION FILED 11110.17, 1910'.

1,006,378. 1 Pateiitea 001. 17,1911.

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VALVELESS LUBRICATING PUMP.

APPLICATION FILED DEG.17, 1910.

1,006,878, 7 Patented Oct. 17, 1911.

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wh ssesf flr/ezziar OTTO HAJ'EK, OF VIENNA, AUSTRIA-HUNGARY.

VALVELESS LUBRICATING-PUMP.

11.,tMT6378.

To all whom it may. concern:

Be it known that I, OTTO HAJEK, subject of the Emperor of Austria-Hungary, residing at Vienna, Austria-Hungary, have invented certain new and useful Improvements in Valveless LubricatingPumps, of which the following is'a specification.

This invention relates to valveless lubricating pumps which have no separate distributing piston and in which the feeding piston itself controls the feeding of the oil into the cylinder space as also the discharge of the oil into the pressure feeding pipe, the said feeding piston performing not only a to-and-froreciprocating motion but also simultaneously an oscillating motion around its longitudinal axis. This is performed in a more simple manner than it could be performed until now and viz., by the following means: (1) The piston is provided on its end projecting out of he'pistoncylinder with a cross-head in which the part that produces the oscillating motion engages eccentrically to the longitudinal axis, of the piston. (2) At the same time the piston is provided on its lower end with a recess or port which according to the position of the piston can place the cylinder space beneath the piston in communication either with the oil admission opening or with the opening for the discharge of the oil.

In the accompanying drawings Figures 1 and 2 show in vertical and horizontal sections a lubricating device in which a valveless pump according to the present invention is comprised. Fig. 3 shows the piston and cylinder in longitudinal section, Figs. 4 and show the same parts in cross-section, Fig. 4 representing the valve in the position in which the admission from the oil receptacle into the space of the cylinder is provided for, whereas Fig. 5 represents the piston in the position in which the discharge of the oil from the cylinder into the pressure pipe is provided for. Figs. 6, 7 and 8 represent a modification of the piston according to which the lubricating oil is enabled to pass between the piston and the wall of the cylinder to the underside of the piston, the exterior part of the piston being suitably recessed to perform this function. Figs. 9 and 10 show a modified construction wherein a plurality of lubricating pumps are provided.

Referring to Figs. 1 and 2 within the oil receptacle f is arranged the oil pump cylinder g in which the pump piston 6 works.

Specification of Letters Patent.

Application filed December 17, 1910.

Patented Got. 17, 1911. Serial No. 597,881.

The piston carries on its exterior end and rigid therewith a cross-head it provided with the recess 2. The pin 00 loosely fitting into the said recess .2 is thus in engagement with the cross-head h of the piston eccentrically to the axis of the latter. The pin 90 is afi'ixed to the disk 3 eccentrically to the axis of the operating shaft 0. y p

The piston is provided on its lower end working within the cylinder with a longitudinal recess 7c (Figs. 3-8) which opens both at the peripheral surface of the piston as also at its bottom surface, so that according to the position of the piston the cylinder casing can' be brought into communication either with the admission channel Z or with the discharge channel'm. When the shaft 0 is rotated the pin 02 describes a circular path and imparts to the piston c not only a vertically reciprocatorymotion but also a horizontally oscillatory motion. In this manner the recess 7c provides during the suction stroke of the piston for communication. between the oilreceptacle and the cylinder while during the pressure stroke it provides for communication between the interior of the cylinder and the pressure pipe. The disclosure of the pin :20 or equivalent part as operated in a circular path, is to be regarded merely by way of example.

Figs. 9 and 10 show in vertical and horizontal sections an arrangement in which the 'shaft imparts motion to more than one piston, e. to a pair of pump pistons e, c, as in the example shown. For this purpose between theshaft 0 and the said pistons c, e is arranged as an intermediate connection the shaft 0!. which is associated by its arm 6 with the disk 3 and by the arms 0!, d with the cross-heads k, h of the pistons e, e. The intermediate shaft is rotatable in its bearings c, i but it is also axially reciprocatory and by such movement it transfers the circular motion of the arm 6 to the arms d, d which on their part impart motion to the pistons e, e.

I claim.

1. In a valveless lubricating pump, the combination With a lubricant receptacle, a cylinder, and a discharge pipe, the cylinder communicating both with the receptacle and with the discharge pipe, of a piston vertically reciprocatory in the cylinder and having a duct which opens to its peripheral and its under face, a recessed head provided on the upper-end of said piston and rigid therewith, a pin engaging in the recess of the head eccentr'ically to the axis of the piston, and an element to which the pin is fixed and which is operable to cause a movement of the pin in a closed curved path, the pin thereby causing both a vertically reciprocatory and horizontally oscillatory movement of the piston whereby its duct is caused, in accordance with the position of the piston, to alternately establishthe communication of the cylinder, first with the receptacle and then with the discharge pipe.

2. In a valveless lubricating pump, the

v combination with a lubricant receptacle, a

pair of cylinders, and a'discharge pipe for each cylinder, the cylinders communicating also with the receptacle, of a piston vertically reciprocatory in each cylinder and having a duct which opens to its peripheral and its under face, a recessed head provided on the upper end of each piston and rigid therewith, a pin engaging in the recess of each head eccentrically to the axis of the corresponding piston, a horizontal shaft carrying the pins and mounted for both rocking and axially reciprocatory movement, an operating shaft disposed at rightangljes to the first named shaft, and an operative connection bet-ween the shafts to cause simultaneously both rocking and axially "recip: rocatory movements of the first named shaft whereby the pins describe closed curved paths and produceboth axially reciprocatory and horizontally oscillatory movements of the pistons so that their ducts in accordance with the positions of the pistons alternately establish the communication of the cylinders, first with the receptacle and then with the discharge pipes.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses'.

OTTO HAJEK. Witnesses:

JOSEF RUBARCH, AUGUST FUGGER. 

